<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
    <script src="../vue.js/vue.js"></script>
</head>
<body>
    <div id="root">
        姓:<input type="text" v-model="firstName"><br/>
        名:<input type="text" v-model:value= "lastName"><br>
        全名：<span>{{firstName}}-{{lastName}}</span>

    </div>
</body>
<script>
    new Vue({
        el:'#root',
        data:{
            firstName:'轨',
            lastName:'迹',
        }
    })
</script>
</html>